Gas burner



Sept. 27, 1938.

c. A. AC-HTERFELDT GAS BURNER Filed Dec. 6, 1937 INVENTOR ATTORNEYPatented Sept. 27, 138

PATENT OFFICE GAS BURNER Carl Alexis Achterfeldt, Dusseldorf, GermanyApplication Deoember c, 1937, Serial No.'178, 233 In Germany November16, 1936 s alarms.

' burners used in heating parts to be welded have been provided with agas-air mixture which was discharged out of a longitudinal slot or anumber of separate nozzles dispersing the mixture through a longitudinalchannel formed by material such as stones of fireproof or refractorycomposition so as to direct the gas-air mixture upon the welding seam inthe workpiece. In such devices the heating flame, after its contact withthe weld seam, has been exhausted directly into the air in a highly'inefllcient and uneconomical manner. As a result such devices have onlybeen suitable forgases having a high rate of ignition and a high burningtemperature.

The present invention overcomes these difliculties by conserving theheated gases, preferably through which. the combustion gases escapeafter contacting thematerial to be welded. In this manner the heat isconcentrated and the heated outlet channels, in addition toconcentrating the gas, economize in the amount of gas necessary toproduce a desired temperature and make it possible to obtain suchtemperature rapidly even when cheap qualitygases are used which nor:mally' produce a low temperature. Furthermore, the heat collectingelements may be so arranged as to extend beyond the combustion area andserve as preheaters for the work to be welded.

Another feature of the invention is that the device is simple inconstruction, readily assembled from materials which areavallable andlow in cost.

Although the novel features which are believed to be characteristic ofthis invention will be particularly pointed out in the claims appendedhereto, the invention itself, as to its objects and advantages, and themanner in which it may be carried out, may be better understood byreferring to the following description taken in connection with theaccompanying drawing forming a part .thereof, in which:

and also so as to adjust the size of the channels Fig. 1 is a frontelevation of my improved burner;

Fig. 2 is a vertical cross section of my improved burner, taken alongthe line 2-=2 of Fig. 1;

Fig. 3 is a detail view of an element of the invention; and v Fig. 4 isa cross section on line fl4 of th ment shown in Fig.3-

In the following description and in the claims, various details will beidentified by specific names for convenience, but they are intended tobe as generic in their application as the art will permit.

The burner comprises basically a mixer pipe i into which combustiongases with a desired amount of air may be fed as by the'pipes 6. Burnernozzles 2 of any desirable type such as are adapted to the gases used,serve as combustion nozzles and direct the flame toward the parts to bewelded. Burner "and collector elements 3 which form a channel l3,directing the gases discharged from the nozzles 2 against a work piece 4may be adjustably mounted in. the path of the flame to limit the size ofthe combustion chamber e eleand predefine the heating area and thetemperature to be reached or maintained. The collector elements 3 areheld in proper spaced relation by any desired means such as adjustableangle irons or other well known devices.

In addition to the gas coming through the pipes 6 which may also haveair mixed therewith, heated air in such volume asmaybe desired may befed into the feeder pipes 6 from additional feeder pipes 'l which arepreferably connected to preheaterst. The preheaters 8 obtain air fromany desired source, not'here'shown, and are heated by the combustiongases which pass through the channel i3 formed by the elements 3 andchannels informed by passagesbetween the elements 3 andadditional-collecting elements 5 made of desirable fireproof orrefractory n aterialan'd mounted in any suitable adjustable bracket. Thecollecting elements! may be adjustably mounted and so positioned againstthe work mater ial 4 that all of the gases escape. through the channelsIll, or spaced from the work piece 4 so as to provide additional outletchannels it. .It can be seenthat as the mixture of gases passes throughthe and 3 in relation to the channels ll formed between the workpiece-4and the collecting elements 5.

To assure proper mixture of the gases in the mixer pipe I, baiiie plates9 may be provided.

These bailles 8, in addition to mixing the gases, may aid in expellingthem through the nozzles 2 into thechannel l 3 where they ignite.

Asis shown in Fig. 1, the heat and gas collectlug elements 3 and 5 mayextend beyond the combustion area. These may then serve as preheatersnot only for-the pipes 8, but for the work to be welded.

In operation, the gases for ignition may be turned on and allowed toburn either with or without any working 01' the device. As the gasesstart to burn, it they are relatively low combustion gases, thetemperature within the area defined by the collector elements 3 and .5may be below the weldlng'temperature of the work to be welded. However,as they burn, the air in the preheaters 8 will be heated with consequentpreheating of the gases of combustion. Furthermore, the collectingelements 3 will be heated and consequently the temperature of thecombustion chamber defined by the elements 3 and 5 will he raised. Itcan thus be seen that gases which ordinarily would not produce asufilcient temperature for welding maybe superheated to produceefi'ective welding temperature.

By prolonging the elements I and 5 beyond the combustion area,preheating chambers may be formed. Thus, the workto be welded may bepreheated so that where it reaches the welding area it willbe very nearits fusion point and its introduction into the combustion zone will notlower the temperature thereof substantially. Furthermore, such preheatedchambers may aid materially in raising the temperature in the combustion chamber above the temperature norm attainable.

As the elements 5 are movable, once the desired temperature within thecombustion area is reached, it may be -maintained as by moving theelements 5 away from the work 4, the channels it will exhaust thedesired amount of gas and prevent overheating.

While certain novel features of the invention have been disclosed andarepointed out in the annexed claims, it will be understood that variousomissions, substitutions and changes may be made by those skilled in theart without departing irom the spirit of the invention. v

Having thus described and ascertained my invention I declare that what I.claim is:

1. A gas burner for flame welding, comprising a gas mixture pipe, meansfor supplying a combustible gas to said pipe, a plurality of dischargenozzles in said pipe. adlustable heat resistant elements adjacent saiddischarge nozzles defining. a longitudinal slot, said discharge nozzlesadapted to discharge said mixture between said elements, additional heatresisting elements spaced from said first elements and adapted incooperation with said first elements and a piece of mabustion chamberinto which said burner discharge nozzles protrude, said gas accumulatorelements defining channels therebetween adapted to exhaust the burnedgases ifrom said burner discharge nozzles, preheating P pes located inthe exhaust path of said gases and pipes connecting said preheatingpipes to said mixer pipe.

3. A burner for welding, comprising a mixer chamber, gas inlet pipesthereto; air inlet pipes connected therewith, burner discharge nozzlestherein, heat and gas accumulating elements adjacent the end of saidburner discharge nozzles adiustably mounted with respect thereto to forman elongate combustion chamber, additional heat and gas accumulatorelements adjustably mounted and spaced from said first elements to forma heat and gas accumulating chamber, chaniigls between saidelementsadapted to exhaust e gases, said elements and said chamberextending beyond the area occupied by said burner discharge nozzles,preheater pipes located adjacent said heat accumulating elements and inthe path of the exhaust channels formed between said elements, saidpreheater pipes connected to said gas inlet pipes.

4. A burner for welding, comprising an air-gas mixture pipe, a dischargenozzle therefor, gas

accumulating elements, air conducting pipes connected at one end to saidmixture pipe and at the other end to a preheating pipe, said gasaccumulating elements arranged to direct said accumulated gases uponsaid preheating pipe.

' 5. A burner for welding, comprising a combustion gas mixer pipe, gasinlet pipes connected thereto, air inlet pipes connected therewith,baiiles in said mixer pipes adapted to aid in mixing said air and gas,burner discharge nozzles in said mixer pipe, elongate heat resisting andaccumulating elements-adjacent said burner discharge nozzles Iorming acombustion chamber, a second set oi heat resisting and accumulatingelements spaced from said first elements to a heat'accumulating chamber,the spaces between said elements adapted to exhaust the gases from saidchambers, preheated pipes adjacent said elements in the path of saidexhaust pipesconnecting said preheater pipes and said air inlet pipes,all oi said accumulator elements extending beyond said combustionchamber forming a preheater chamber. I

CARL ALEXIS ACH'IERFEIDT.

